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SUMMARY:HyDRA: A New Paradigm for Atmospheric Retrieval of Exoplanets - Si
 d Gandhi (Cambridge)
DTSTART:20171129T160000Z
DTEND:20171129T170000Z
UID:TALK87901@talks.cam.ac.uk
CONTACT:Ed Gillen
DESCRIPTION:Thermal emission spectra of exoplanets provide constraints on 
 the chemical compositions\, pressure-temperature (P-T) profiles\, and ener
 gy transport in exoplanetary atmospheres. Accurate inferences of these pro
 perties rely on the robustness of the atmospheric retrieval methods. While
  retrieval codes have provided significant constraints on molecular abunda
 nces and temperature profiles in several exoplanetary atmospheres\, the co
 nstraints on their deviations from thermal and chemical equilibria have ye
 t to be fully explored. HyDRA\, our new disequilibrium retrieval framework
 \, is a step in this direction. For a given dataset\, the retrieved chemic
 al compositions and P-T profiles are used in tandem with our self-consiste
 nt atmospheric model to constrain layer-by-layer deviations from chemical 
 and radiative-convective equilibrium in the observable atmosphere. We demo
 nstrate this on the Hot Jupiter WASP-43b with a high-precision emission sp
 ectrum. We retrieve a water vapour mixing ratio that is solar\, in agreeme
 nt with previous studies. With our disequilibrium analysis we find that th
 e dayside P-T profile is consistent with radiative-convective equilibrium 
 and that the derived compositions are also consistent with thermochemical 
 equilibrium. In the era of high precision and high resolution emission spe
 ctroscopy\, HyDRA provides a path to retrieve disequilibrium phenomena in 
 exoplanetary atmospheres.
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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